No anti-aliasing for cartoline symbol?

[William K]

I've been using cartolines for a while.  I think you need to specify
antialias in the STYLE for a class, not the symbol.  The antialias in
the SYMBOL definition (as Ken Lord said) is for truetype fonts.

Oh, not paying attention to your example, I see you do say antialias in
the style.  Hmm, foggy... memory... try specifying the linecap,
linejoin and linejoinmaxsize in your symbol, I think I may have had
problems when I didn't (all mine do now), even if you specify same as
the defaults.

It's been a while since I used the antialias for cartolines, tho - I
think it's a bit slow, or the quality wasn't all that great (I believe
it's done by GD?).  And if you still use normal lines also in a map,
there will be a mix of aliasing and antialiasing.


I switched to a different method that gives accross-the-board
antialiasing - design and draw the map at 2x or 4x size with no
antialiasing anywhere, then use PHP's image functions to resample the
image with antialiasing.  I find that the antialiasing produced this
way looks much better, closer to what I expect from using graphics
programs, even for font rendering.  Requires PHP-MapScript of course,
and a bit of programming, but it works fine.  Unless you have a fast
processor, the 4x will be pretty slow, but it looks better.  I even use
this method for generating high quality PDF output, instead of using
mapserver's builtin PDF output.


On Apr 1, 2005, at 9:11 AM, James Sohr wrote:

> Like so many others, I've used the circle symbol with various  sizes to
> draw my lines for the past few years.  The results have been pretty
> good,
> but the aliasing on the roads has always bothered me, especially when
> the
> true-type labels are beautfully anti-aliased right beside them.
>
>
> I recently read in the archives that the relatively new cartoline
> symbol
> supports anti-aliasing.  However, when I use the cartoline symbol and
> turn
> antialiasing on, the lines drawn are still aliased.
>
>
>
> I'm using Mapserver 4.5 on Windows XP with the latest GD library.  Is
> there something in my setup that is preventing the cartoline from being
> anti-aliased?  Does someone have an online example that shows the
> cartoline symbol being anti-aliased?
>

-----
William Kyngesburye <kyngchaos at charter.net>
http://webpages.charter.net/kyngchaos/

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